I disagree. The 78 series IS designed for water. Both the 78 and 76 series are pretty mediocre for the road, IMO. I have a Nuvi for the road (voice instructions, etc).
I have been using the 78 for night routes in Mosquito lagoon and have been very pleased with the operation.
With the 78 when you come to the end of a route you have to go to the route planner and select "Reverse Route" option to return. If you plotted a route there and back, depending on what options you have set, you may need to get within a (configurable) proximity to the point, otherwise the GPS will not realize that you reached it and will keep directing you there. There are options for how the unit routes you to the next leg. You can set it to Automatic, Manual (which allows you to select the next leg) or by a certain distance.
You can choose to have the unit lock to a road, or not. I turn this off. If you choose the marine profile (profiles are new to the 78), it will set the options as you would expect for marine use. There are different profiles for marine, automotive, fitness, etc.
There are a lot of new and different features. It takes awhile to sort it out.
Sport Cases (Electronics)
Rescue / Throw Bags
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